There are some nice ideas there, but I'm not keen on the battery tray in my opinion - one strap - no matter how big - isn't enough in my opinion. Maybe I'll be proved wrong but I'm not keen.
5S is only heavy if you have a big one!
How long do you need it to run for?
I'd get:
Option 1
-Elite RCD motor mount
-RC-Monster MBX6 Battery tray (pre drilled for RX8 to mount to the back)
Option 2
-RC-Monster MBX6 Conversion kit (includes Rx mount + servo mount)
The Rest
-Slipperential
-Tekin RX8 with 1700KV motor
-Hyperion VX 5S 3300mAh battery (for 10-15 minutes run time on the track)
I wouldn't worry about the Rx being exposed - look at 1/10th! Not only that - are you going to run it when it's wet? Risking that ESC and battery?
Or, stick the Rx in a balloon - like the good ol' days.
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